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Main.cc: In function ‘int main()’:
Main.cc:5:12: error: expected unqualified-id before numeric constant
 #define pi 3.14
            ^
Main.cc:11:10: note: in expansion of macro ‘pi’
   double pi = 4.0;
          ^~
Main.cc:13:22: error: lvalue required as left operand of assignment
     pi+=(-1)^i/(2*i+1);}
                      ^
Main.cc:14:28: error: lvalue required as left operand of assignment
   pi = round(pi * 100000)/ 100000;
                            ^~~~~~
Main.cc:8:8: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&n);
   ~~~~~^~~~~~~~~